Available optional signals
RASC units have the following signals that are described in the following table.
These signals are set up through the PCB of the RASC unit.
?
N O T E
Do not set same function to multiple input/output ports. If set, the setting of the higher input/output number is cleared to
00
.
Input signals (CN1 and CN2)
Indication
Input signal
Application
0
No setting application
No setting.
Fixing the heating mode
This signal allows to pre-fix the heating operation mode independently of what the
indoor unit requests. If the indoor units request the opposite mode than the RASC
unit, the compressor does not start.
Fixing the cooling mode
This signal allows to pre-fix the cooling operation mode independently of what the
indoor unit requests. If the indoor units request the opposite mode than the RASC
unit, the compressor does not start.
This function is intended for those applications such as computer rooms, where the
cooling mode is fixed throughout the year.
3
Demand thermo OFF
This signal allows to stop the compressor as well as to put the indoor unit in Thermo-
OFF condition.
When the compressor is stopped, this function allows the operation of the indoor unit
fans to prevent from air stratification.
4
No setting application
No setting.
5
Forced stoppage
This signal allows to control the stoppage of the compressor and the fans of the
indoor as well as RASC units.
This function can be useful when used with the alarm signals of the fire prevention
systems.
6
Current control demand (60%)
These signals allow to regulate the input current around the selected percentage
(60%, 70%, 80% or 100%) of the maximum compressor current.
This function provides energy-saving by limiting the installation power consumption.
7
Current control demand (70%)
8
Current control demand (80%)
9
Current control demand (100%)
0
No setting application
No setting.
Output signals (CN7)
Indication
Output signal
Application
0
No setting application
No setting.
Operation signal
This signal allows to notify that the unit is operating. It enables to start up additional
systems such as humidifiers, fans and other additional air-conditioning systems.
Alarm signal
This signal allows to notify that protection devices have been activated and to
transfer it to additional systems.
3
Compressor ON signal
This signal allows to notify that the compressor is activated. This function can be
applied for situations such as checking signals during remote-control operation and
for the interlock of the RASC unit.
4
Defrost operation signal
This signal allows to notify that the unit is under defrosting operation.
6 Optional functions
Optional external input and output signals
SMGB0091 rev.2 - 11/2015
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